EP0134545A1 - Spliced, reinforced urethane articles - Google Patents
Spliced, reinforced urethane articles Download PDFInfo
- Publication number
- EP0134545A1 EP0134545A1 EP84109287A EP84109287A EP0134545A1 EP 0134545 A1 EP0134545 A1 EP 0134545A1 EP 84109287 A EP84109287 A EP 84109287A EP 84109287 A EP84109287 A EP 84109287A EP 0134545 A1 EP0134545 A1 EP 0134545A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spliced
- fingers
- article according
- reinforced urethane
- fabric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G3/00—Belt fastenings, e.g. for conveyor belts
- F16G3/10—Joining belts by sewing, sticking, vulcanising, or the like; Constructional adaptations of the belt ends for this purpose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/114—Single butt joints
- B29C66/1142—Single butt to butt joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
- B29C66/22—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns
- B29C66/223—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns being in the form of a triangle wave or of a sawtooth wave, e.g. zigzagged
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
- B29C66/22—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns
- B29C66/225—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns being castellated, e.g. in the form of a square wave or of a rectangular wave
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
- B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
- B29C66/4324—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms for making closed loops, e.g. belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
- B29C66/4329—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms the joint lines being transversal but non-orthogonal with respect to the axis of said tubular articles, i.e. being oblique
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/721—Fibre-reinforced materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
- B29C65/483—Reactive adhesives, e.g. chemically curing adhesives
- B29C65/4835—Heat curing adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
- B29C66/024—Thermal pre-treatments
- B29C66/0242—Heating, or preheating, e.g. drying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/431—Joining the articles to themselves
- B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
- B29C66/43129—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams said flat seams being transversal but non-orthogonal with respect to the tubular or hollow articles, i.e. oblique
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/721—Fibre-reinforced materials
- B29C66/7212—Fibre-reinforced materials characterised by the composition of the fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/721—Fibre-reinforced materials
- B29C66/7214—Fibre-reinforced materials characterised by the length of the fibres
- B29C66/72141—Fibres of continuous length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts
- B29L2031/7092—Conveyor belts
Definitions
- the present invention relates to a spliced, reinforced polyurethane article wherein fingers on each article end are adhered together.
- splices In the field of fabric reinforced urethane belts, four general types of splices have been utilized.
- One type of splice is the overlap splice. This splice merely related to overlapping one end of an article with the remaining end and maintaining them together as through an adhesive or a mechanical fastener, for example, a staple.
- a disadvantage of this type splice is that it is uneven.
- An alligator clip type splice relates to the use of staples which are embedded in one end of an item. The remaining end of the staple engages a pin. The other end of the item also has a staple therein with the free end thereof engaging the remaining side of the pin. Thus, the pin would mutually engage the staples of both ends and thereby connect the article together.
- skive splice Another commonly used type splice is the skive splice.
- the ends of the article or articles are cut at an angle with respect to the horizontal and matingly engage one another. They are held together through the use of an adhesive.
- the last common type of splicing often referred to as a mechanical splice relates to a plate located on the top as well as another plate located on the bottom of the ends of an article or articles.
- a bolt or other fastener extends between the two plates and forms a crimp or pressure engagement to form the splice.
- splices have served in a somewhat adequate capacity, they generally possess low tensile strength and hence can be readily separated when subjected to a large force.
- the mechanical splice as well as the alligator clip type splice generally have exposed metal surfaces which can dull objects such as a knife being used upon the surface of the item. Additionally, they can be displaced or moved when a metal object such as a knife is used thereon.
- a typical reinforced urethane article is shown in Fig. 3, generally indicated by the numeral 10, containing a reinforcing ply 12 therein.
- Ply 12 is generally made from a fabric such as nylon, Kevlar, polyester, or fiberglass, with polyester usually being preferred. Although more than one ply can be utilized, generally only one ply is needed.
- the urethane component 14 can generally be any conventional or common urethane known to the art.
- the polyurethane elastomer is made in a conventional manner such as in the form of a low molecular weight polymer basic intermediate with hydroxyl end groups. This may be a polyester, a polyether, or a mixed polyester-polyamide.
- the basic intermediate is then reacted with a diisocyanate, preferably an aromatic diisocyanate, to yield a prepolymer.
- a diisocyanate preferably an aromatic diisocyanate
- Numerous diisocyanates can be utilized such as 2,4-tolylenediisocyanate, pp-diphenylmethane diisocyanate, and the like.
- Such an elastomer is applied to ply 12 such that it usually impregnates the ply as well as encapsulates it.
- the urethane is then cured by chain extension which results from a reaction between the isocyanate end groups and a curing agent such as a glycol, diamine, diacid, or an amino alcohol.
- Urethane article 10 can have a polyester weave having greater strength warp cords than weft cords, based upon per linear inch of width, and be made from a polyurethane such as Vibrathane 6020, manufactured by Uni- royal, or Multrathane F 242, manufactured by Mobay. Both polyurethanes are essentially polyester-based and utilize butane diol as the curing agent.
- the present invention relates to the utilization of fingers 20 which desirably matingly engage each other through ends 22 and 23.
- the fingers are of the squared-off type. That is, the ends thereof are essentially squared off or extend at a small angle with regard to the long edge of the article.
- fingers 20 of the embodiment of Fig. 1, or a portion thereof have a slight taper such that they are thicker at their base point than at their end portion.
- a small, generally uniform gap 21 exists between the fingers.
- fingers 30 are generally tapered throughout their length, that is from their wide base portion to their narrow tip portion and matingly engage corresponding or similarly shaped figures on the other end of the article or the remaining article.
- the tapered embodiment of Fig. 2 is preferred in that it yields greater surface areas so that a better bond between end portion 32 and the remaining end portion 33 of an article, for example a conveyor belt.
- the length of the fingers can vary but generally extend to a length such that there is a balance between the fabric strength and the adhesive strength.
- the taper of the fingers is such that a surface area exists that when adhered with an adhesive, yields a joint or connection strength approaching or even exceeding the fabric strength of the ply.
- a small, generally uniform gap exists between the fingers.
- An adhesive is then applied to gap 31 as well as over and beneath article end portions 32 and 33, as in Fig. 3, to form a splice.
- Figs. 1 and 2 specific styles of fingers or engagements between two end portions are shown in Figs. 1 and 2, it is to be understood that the present invention is not limited thereto. Rather, any style finger can be utilized such that the surface area is increased to accommodate a larger load transfer. Moreover, it is preferred that the fingers are cut such that they traverse a reduced number of warp cords, as in Fig. 2. In other words, an abrupt break in fabric continuity should be held to a minimum or eliminated. Thus, it is not within the present invention to produce a splice wherein one continuous straight cut exists across the entire article as for example at a 22 degree angle.
- fingers are desirable which extend in the direction of the warp cords and traverse said cords at a shallow or acute angle, generally less than 20 degrees, and desirably less than 15 degrees.
- a shallow or acute angle generally less than 20 degrees, and desirably less than 15 degrees.
- fingers 20 of Fig. 1 do have a slight taper such that they do cut some warp cords
- the embodiment of Fig. 2 is preferred wherein all of the warp cords are cut at a shallow angle, that is at an angle almost parallel to the direction of the warp cords.
- the angle of the finger tips and base across the article can generally be any angle although 22 1/2 degrees is preferred.
- Adhesive 40 can generally be any type of adhesive but preferably is a curable or vulcanizable urethane. Thus, it can even be the same material as utilized in making of the fabric reinforced article.
- a suitable adhesive is Catapol SR 90, manufactured by Arnco. Essentially, this is a 100 percent total solids polyester-based urethane adhesive system using a glycol, for example butane diol as the curing agent. Solvent adhesives are generally not preferred due to severe blistering during cure. Naturally, the curing agent is cured at its cured temperature which will vary depending upon the exact adhesive utilized.
- the present invention can be utilized to splice two ends of the article together, as for example a belt, such as a conveyor belt, etc., to form an integral object. Also, it can be utilized to splice together two ends of two different polyurethane articles.
- the present invention can be utilized wherever fabric reinforced urethane articles such as belts have previously been utilized, as for example, conveyor belts for carrying various materials wherein high abrasion resistance, and cut resistance is desired.
- fabric reinforced urethane articles such as belts have previously been utilized, as for example, conveyor belts for carrying various materials wherein high abrasion resistance, and cut resistance is desired.
- One such area of use is in the conveying of green, that is unbaked, bricks.
- reinforced urethane belts usually have one ply but should two plies be utilized, the present invention can also be utilized.
- a polyester, reinforced urethane belt is cut according to a style set forth in Fig. 2. That is, the fingers tapered continuously from their base to their tip, a distance of approximately 5 inches. A small space or uniform gap, for example 1/16-1/8 inch, is cut between the fingers of adjacent portions.
- the belt is a Novitane CU-85 conveyor belt manufactured by B.F. Goodrich, having a Nylock polyester ply therein. The belt is then placed on a plywood sheet having release paper thereon. The fingers of the two end portions are then aligned. Also, a brad is inserted into various adjacent fingers where necessary to maintain even spacing. Desirably, the belt is preheated. Next, an adhesive is poured into the finger gaps.
- the adhesive is a precatalyzed polyurethane elastomer, Catapol SR 90A, manufactured by Arnco, South Gate, California. A sufficient amount of said adhesive is poured in the gaps to be sure that the gaps are filled. Desirably, the adhesive is heated slightly, as for example, to about 150°F to 210°F, and preferably about 175°F to reduce its viscosity and aid in pouring. Another piece of release paper was placed on top of said splice. A piece of sheet steel was then placed on top of this. Cure was made at 280°F for approximately two and one half hours with only slight pressure being necessary. The belt splice was further cured by ambient air.
- the tensile strength per inch of width of the totally tapered embodiment was substantially higher than the squared type finger embodiment of Fig. 1.
- other splices having a continuous taper as in Fig. 2 have yielded tensile stregts approaching that of the control, that is an un- spliced area of a belt.
Abstract
A reinforced urethane article such as a belt is spliced together. One end of the article has fingers which engage fingers of the remaining article end. An adhesive binds the fingers together to form the splice. A particular area of use includes splicing of conveyor belts.
Description
- The present invention relates to a spliced, reinforced polyurethane article wherein fingers on each article end are adhered together.
- Heretofore, in the field of fabric reinforced urethane belts, four general types of splices have been utilized. One type of splice is the overlap splice. This splice merely related to overlapping one end of an article with the remaining end and maintaining them together as through an adhesive or a mechanical fastener, for example, a staple. A disadvantage of this type splice is that it is uneven.
- An alligator clip type splice relates to the use of staples which are embedded in one end of an item. The remaining end of the staple engages a pin. The other end of the item also has a staple therein with the free end thereof engaging the remaining side of the pin. Thus, the pin would mutually engage the staples of both ends and thereby connect the article together.
- Another commonly used type splice is the skive splice. In this splice, the ends of the article or articles are cut at an angle with respect to the horizontal and matingly engage one another. They are held together through the use of an adhesive.
- The last common type of splicing often referred to as a mechanical splice relates to a plate located on the top as well as another plate located on the bottom of the ends of an article or articles. A bolt or other fastener extends between the two plates and forms a crimp or pressure engagement to form the splice.
- Generally, while such splices have served in a somewhat adequate capacity, they generally possess low tensile strength and hence can be readily separated when subjected to a large force. Moreover, the mechanical splice as well as the alligator clip type splice generally have exposed metal surfaces which can dull objects such as a knife being used upon the surface of the item. Additionally, they can be displaced or moved when a metal object such as a knife is used thereon.
- For a better understanding of the invention described herein, reference is made to the attached drawings, wherein:
- Fig. 1 is a top plan view showing a splice according to the present invention;
- Fig. 2 is a top plan view showing an alternate type splice according to the present invention; and
- Fig. 3 is a cross-sectional view taken on line 3-3 of Fig. 1 showing the spliced reinforced urethane article.
- A typical reinforced urethane article is shown in Fig. 3, generally indicated by the
numeral 10, containing a reinforcingply 12 therein.Ply 12 is generally made from a fabric such as nylon, Kevlar, polyester, or fiberglass, with polyester usually being preferred. Although more than one ply can be utilized, generally only one ply is needed. Theurethane component 14 can generally be any conventional or common urethane known to the art. Generally, the polyurethane elastomer is made in a conventional manner such as in the form of a low molecular weight polymer basic intermediate with hydroxyl end groups. This may be a polyester, a polyether, or a mixed polyester-polyamide. The basic intermediate is then reacted with a diisocyanate, preferably an aromatic diisocyanate, to yield a prepolymer. Numerous diisocyanates can be utilized such as 2,4-tolylenediisocyanate, pp-diphenylmethane diisocyanate, and the like. Such an elastomer is applied toply 12 such that it usually impregnates the ply as well as encapsulates it. The urethane is then cured by chain extension which results from a reaction between the isocyanate end groups and a curing agent such as a glycol, diamine, diacid, or an amino alcohol. Urethanearticle 10 can have a polyester weave having greater strength warp cords than weft cords, based upon per linear inch of width, and be made from a polyurethane such as Vibrathane 6020, manufactured by Uni- royal, or Multrathane F 242, manufactured by Mobay. Both polyurethanes are essentially polyester-based and utilize butane diol as the curing agent. - According to the present invention, greater pickup or load with regard to the common surface area is accomplished. The net result is that the spliced area more nearly approaches the fabric strength. As apparent from the drawings, the present invention relates to the utilization of
fingers 20 which desirably matingly engage each other throughends fingers 20 of the embodiment of Fig. 1, or a portion thereof, have a slight taper such that they are thicker at their base point than at their end portion. A small, generallyuniform gap 21 exists between the fingers. When an adhesive is applied to the finger area, it will penetrate the gap as well as the upper and lower surfaces of the article and form a good bond. - Considering the embodiment of Fig. 2, in this embodiment,
fingers 30 are generally tapered throughout their length, that is from their wide base portion to their narrow tip portion and matingly engage corresponding or similarly shaped figures on the other end of the article or the remaining article. The tapered embodiment of Fig. 2 is preferred in that it yields greater surface areas so that a better bond betweenend portion 32 and theremaining end portion 33 of an article, for example a conveyor belt. The length of the fingers can vary but generally extend to a length such that there is a balance between the fabric strength and the adhesive strength. In other words, the taper of the fingers is such that a surface area exists that when adhered with an adhesive, yields a joint or connection strength approaching or even exceeding the fabric strength of the ply. As with the embodiment of Fig. 1, a small, generally uniform gap exists between the fingers. An adhesive is then applied togap 31 as well as over and beneatharticle end portions - Although specific styles of fingers or engagements between two end portions are shown in Figs. 1 and 2, it is to be understood that the present invention is not limited thereto. Rather, any style finger can be utilized such that the surface area is increased to accommodate a larger load transfer. Moreover, it is preferred that the fingers are cut such that they traverse a reduced number of warp cords, as in Fig. 2. In other words, an abrupt break in fabric continuity should be held to a minimum or eliminated. Thus, it is not within the present invention to produce a splice wherein one continuous straight cut exists across the entire article as for example at a 22 degree angle. Rather, fingers are desirable which extend in the direction of the warp cords and traverse said cords at a shallow or acute angle, generally less than 20 degrees, and desirably less than 15 degrees. In other words, although
fingers 20 of Fig. 1 do have a slight taper such that they do cut some warp cords, the embodiment of Fig. 2 is preferred wherein all of the warp cords are cut at a shallow angle, that is at an angle almost parallel to the direction of the warp cords. The angle of the finger tips and base across the article can generally be any angle although 22 1/2 degrees is preferred. - Adhesive 40 can generally be any type of adhesive but preferably is a curable or vulcanizable urethane. Thus, it can even be the same material as utilized in making of the fabric reinforced article. A suitable adhesive is Catapol SR 90, manufactured by Arnco. Essentially, this is a 100 percent total solids polyester-based urethane adhesive system using a glycol, for example butane diol as the curing agent. Solvent adhesives are generally not preferred due to severe blistering during cure. Naturally, the curing agent is cured at its cured temperature which will vary depending upon the exact adhesive utilized.
- The present invention can be utilized to splice two ends of the article together, as for example a belt, such as a conveyor belt, etc., to form an integral object. Also, it can be utilized to splice together two ends of two different polyurethane articles.
- The present invention can be utilized wherever fabric reinforced urethane articles such as belts have previously been utilized, as for example, conveyor belts for carrying various materials wherein high abrasion resistance, and cut resistance is desired. One such area of use is in the conveying of green, that is unbaked, bricks. Generally, reinforced urethane belts usually have one ply but should two plies be utilized, the present invention can also be utilized.
- The present invention will be better understood by reference to the following examples.
- A polyester, reinforced urethane belt is cut according to a style set forth in Fig. 2. That is, the fingers tapered continuously from their base to their tip, a distance of approximately 5 inches. A small space or uniform gap, for example 1/16-1/8 inch, is cut between the fingers of adjacent portions. The belt is a Novitane CU-85 conveyor belt manufactured by B.F. Goodrich, having a Nylock polyester ply therein. The belt is then placed on a plywood sheet having release paper thereon. The fingers of the two end portions are then aligned. Also, a brad is inserted into various adjacent fingers where necessary to maintain even spacing. Desirably, the belt is preheated. Next, an adhesive is poured into the finger gaps. The adhesive is a precatalyzed polyurethane elastomer, Catapol SR 90A, manufactured by Arnco, South Gate, California. A sufficient amount of said adhesive is poured in the gaps to be sure that the gaps are filled. Desirably, the adhesive is heated slightly, as for example, to about 150°F to 210°F, and preferably about 175°F to reduce its viscosity and aid in pouring. Another piece of release paper was placed on top of said splice. A piece of sheet steel was then placed on top of this. Cure was made at 280°F for approximately two and one half hours with only slight pressure being necessary. The belt splice was further cured by ambient air.
-
- As apparent from Table I, the tensile strength per inch of width of the totally tapered embodiment, that is Fig. 2, was substantially higher than the squared type finger embodiment of Fig. 1. Moreover, other splices having a continuous taper as in Fig. 2 have yielded tensile stregts approaching that of the control, that is an un- spliced area of a belt.
- While in accordance with the patent statutes, a best mode and preferred embodiment has been illustrated, the invention is not limited thereby, the scope of the invention being limited by the scope of the attached claims.
Claims (15)
1. A spliced, reinforced urethane article, comprising:
a first reinforced urethane item having an end portion;
a second reinforced urethane item having an end portion;
said first urethane end portion connected to said second urethane end portion through the splice;
said first end portion having a plurality of fingers extending therefrom;
said second end portion having a plurality of fingers extending therefrom; and
said fingers connected together by an adhesive.
2. A spliced, reinforced urethane article according to Claim 1, wherein said reinforcement is a fabric.
3. A spliced, reinforced urethane article according to Claim 2, wherein said fingers of said first end portion matingly engage said fingers of said second end portion.
4. A spliced, reinforced urethane article according to Claim 3, wherein at least a portion of said fingers are tapered.
5. A spliced, reinforced urethane article according to Claim 4, wherein said fingers have a squared-off end portion.
6. A spliced, reinforced urethane article according to Claim 4, wherein said fingers have a taper from their base portion to their tip.
7. A spliced, reinforced urethane article according to Claim 6, wherein a gap exists between said fingers, and said adhesive resides within said gap, and wherein said adhesive is a urethane-based adhesive.
8. A spliced, reinforced urethane article according to Claim 4, wherein said fingers are tapered throughout their entire length a distance such that there is an approximate balance between the strength of said fabric and the strength of said connecting cured adhesive.
9. A spliced, reinforced urethane article according to Claim 7, wherein said fingers are tapered throughout their entire length a distance such that there is an approximate balance between the strength of said fabric and the strength of said connecting adhesive.
10. A spliced, reinforced urethane article according to Claim 6, wherein said article is in the form of a belt.
ll. A spliced, reinforced urethane article according to Claim 9, wherein said article is in the form of a belt.
12. A spliced, reinforced urethane article according to Claim 4, wherein said fabric is in the form of at least one ply having weft and warp cords and wherein said fabric is made of polyester.
13. A spliced, reinforced urethane article according to Claim 11, wherein said fabric is in the form of at least one ply having weft and warp cords and wherein said fabric is made of polyester.
14. A spliced, reinforced urethane article according to Claim 12, wherein said taper forms an acute angle with said warp cords.
15. A spliced, reinforced urethane article according to Claim 13, wherein said fabric is in the form of at least one ply having weft and warp cords and wherein said fabric is made of polyester.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US52093483A | 1983-08-08 | 1983-08-08 | |
US520934 | 1983-08-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0134545A1 true EP0134545A1 (en) | 1985-03-20 |
Family
ID=24074642
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84109287A Withdrawn EP0134545A1 (en) | 1983-08-08 | 1984-08-04 | Spliced, reinforced urethane articles |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0134545A1 (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2231529A (en) * | 1989-03-04 | 1990-11-21 | Scapa Group Plc | Improvements in or relating to papermakers and like fabrics |
WO1991002452A1 (en) * | 1989-08-14 | 1991-03-07 | Thomas Bartlett Snell | Improvements relating to belts for baling machines |
US5341609A (en) * | 1992-01-28 | 1994-08-30 | Minnesota Mining And Manufacturing Company | Abrasive belts and their manufacture |
US5529590A (en) * | 1993-05-20 | 1996-06-25 | Minnesota Mining And Manufacturing Company | Process for the manufacture of endless coated abrasive articles |
EP0933555A2 (en) * | 1998-01-28 | 1999-08-04 | Mol Belting Company | Conveyor belt joint |
WO2000020197A1 (en) * | 1998-10-05 | 2000-04-13 | Expanded Seam Technologies, Llc | Stitchless seam construction of elastomeric fabric |
US6086806A (en) * | 1996-04-05 | 2000-07-11 | Ronald H. Ball | Method of splicing thermoplastic articles |
US6237740B1 (en) | 1998-06-30 | 2001-05-29 | Ronald H. Ball | Composite handrail construction |
JP2012007670A (en) * | 2010-06-24 | 2012-01-12 | Nitta Corp | Joint belt |
EP2108860A3 (en) * | 2008-04-11 | 2012-03-28 | Megadyne S. & D. S.r.l. | Toothed belt |
US8323544B2 (en) | 2007-09-10 | 2012-12-04 | Ehc Canada, Inc. | Method and apparatus for pretreatment of a slider layer for extruded composite handrails |
US8820511B2 (en) | 2007-09-10 | 2014-09-02 | Ehc Canada, Inc. | Modified handrail |
US9579839B2 (en) | 2007-09-10 | 2017-02-28 | Ehc Canada, Inc. | Apparatus for extrusion of thermoplastic handrail |
US9981415B2 (en) | 2007-09-10 | 2018-05-29 | Ehc Canada, Inc. | Method and apparatus for extrusion of thermoplastic handrail |
US10160623B2 (en) | 2015-05-07 | 2018-12-25 | Ehc Canada, Inc. | Compact composite handrails with enhanced mechanical properties |
US10350807B2 (en) | 2007-09-10 | 2019-07-16 | Ehc Canada, Inc. | Method and apparatus for extrusion of thermoplastic handrail |
US10399265B2 (en) | 2013-09-26 | 2019-09-03 | Mitsubishi Electric Corporation | Method of manufacturing escalator handrail |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE628473A (en) * | ||||
FR1280735A (en) * | 1960-11-22 | 1962-01-08 | Kleber Colombes | Improvement in joining methods of conveyor belts or transmission belts |
GB901197A (en) * | 1961-04-17 | 1962-07-18 | British Belting And Asbestos L | Improvements in or modifications of a method of jointing textile belting or webbing |
FR1417664A (en) * | 1964-05-08 | 1965-11-12 | Russell Mfg Co | Method of joining the ends of conveyor belts |
US4010655A (en) * | 1976-01-19 | 1977-03-08 | Ernest Pollard | Drive belting and drive belts manufactured therefrom |
GB2074288A (en) * | 1980-04-19 | 1981-10-28 | Deacon R F | Improved Jointing Method |
-
1984
- 1984-08-04 EP EP84109287A patent/EP0134545A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE628473A (en) * | ||||
FR1280735A (en) * | 1960-11-22 | 1962-01-08 | Kleber Colombes | Improvement in joining methods of conveyor belts or transmission belts |
GB901197A (en) * | 1961-04-17 | 1962-07-18 | British Belting And Asbestos L | Improvements in or modifications of a method of jointing textile belting or webbing |
FR1417664A (en) * | 1964-05-08 | 1965-11-12 | Russell Mfg Co | Method of joining the ends of conveyor belts |
US4010655A (en) * | 1976-01-19 | 1977-03-08 | Ernest Pollard | Drive belting and drive belts manufactured therefrom |
GB2074288A (en) * | 1980-04-19 | 1981-10-28 | Deacon R F | Improved Jointing Method |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2231529A (en) * | 1989-03-04 | 1990-11-21 | Scapa Group Plc | Improvements in or relating to papermakers and like fabrics |
GB2231529B (en) * | 1989-03-04 | 1993-07-07 | Scapa Group Plc | Improvements in or relating to papermakers and like fabrics |
WO1991002452A1 (en) * | 1989-08-14 | 1991-03-07 | Thomas Bartlett Snell | Improvements relating to belts for baling machines |
US5470362A (en) * | 1991-01-30 | 1995-11-28 | Minnesota Mining And Manufacturing Company | Method for making coated abrasive belts |
US5341609A (en) * | 1992-01-28 | 1994-08-30 | Minnesota Mining And Manufacturing Company | Abrasive belts and their manufacture |
US5529590A (en) * | 1993-05-20 | 1996-06-25 | Minnesota Mining And Manufacturing Company | Process for the manufacture of endless coated abrasive articles |
US6086806A (en) * | 1996-04-05 | 2000-07-11 | Ronald H. Ball | Method of splicing thermoplastic articles |
US6234304B1 (en) | 1998-01-28 | 2001-05-22 | Mol Belting Company | Conveyor belt joint |
EP0933555A3 (en) * | 1998-01-28 | 2000-03-22 | Mol Belting Company | Conveyor belt joint |
EP0933555A2 (en) * | 1998-01-28 | 1999-08-04 | Mol Belting Company | Conveyor belt joint |
US6237740B1 (en) | 1998-06-30 | 2001-05-29 | Ronald H. Ball | Composite handrail construction |
WO2000020197A1 (en) * | 1998-10-05 | 2000-04-13 | Expanded Seam Technologies, Llc | Stitchless seam construction of elastomeric fabric |
US10350807B2 (en) | 2007-09-10 | 2019-07-16 | Ehc Canada, Inc. | Method and apparatus for extrusion of thermoplastic handrail |
US8323544B2 (en) | 2007-09-10 | 2012-12-04 | Ehc Canada, Inc. | Method and apparatus for pretreatment of a slider layer for extruded composite handrails |
US8820511B2 (en) | 2007-09-10 | 2014-09-02 | Ehc Canada, Inc. | Modified handrail |
US9579839B2 (en) | 2007-09-10 | 2017-02-28 | Ehc Canada, Inc. | Apparatus for extrusion of thermoplastic handrail |
US9981415B2 (en) | 2007-09-10 | 2018-05-29 | Ehc Canada, Inc. | Method and apparatus for extrusion of thermoplastic handrail |
US10940625B2 (en) | 2007-09-10 | 2021-03-09 | Ehc Canada, Inc. | Method and apparatus for extrusion of thermoplastic handrail |
EP2108860A3 (en) * | 2008-04-11 | 2012-03-28 | Megadyne S. & D. S.r.l. | Toothed belt |
JP2012007670A (en) * | 2010-06-24 | 2012-01-12 | Nitta Corp | Joint belt |
US10399265B2 (en) | 2013-09-26 | 2019-09-03 | Mitsubishi Electric Corporation | Method of manufacturing escalator handrail |
US11207814B2 (en) | 2013-09-26 | 2021-12-28 | Mitsubishi Electric Corporation | Method of manufacturing an escalator handrail |
US10287133B2 (en) | 2015-05-07 | 2019-05-14 | Ehc Canada, Inc. | Compact composite handrails with enhanced mechanical properties |
US10160623B2 (en) | 2015-05-07 | 2018-12-25 | Ehc Canada, Inc. | Compact composite handrails with enhanced mechanical properties |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0134545A1 (en) | Spliced, reinforced urethane articles | |
US3472730A (en) | Heat-curable filament-reinforced resinous sheeting and laminating process using same | |
EP0237462B1 (en) | Reinforced composite structure | |
PL316572A1 (en) | Fusible polyurethane glue hardenable by exposure to moisture | |
US20090142572A1 (en) | Power transmission belt and cord adhesive system and adhesion method | |
US3637359A (en) | Coated abrasive belt overlap joint | |
ES2119998T3 (en) | GLUE BY FUSION OF HUMIDITY HARDENABLE POLYURETHANE. | |
US7922869B2 (en) | Shoe press belt | |
US2713884A (en) | Composite elastic structures | |
EP3448667B1 (en) | Method of manufacturing a multiply thermoplastic conveyor belt | |
EP0656926B1 (en) | Blends of polyurethane dispersions with latex emulsions for bookbinding | |
US20230405941A1 (en) | Method for bonding rubber and adhesive for bonding rubber | |
CA2278650A1 (en) | Flat strip lamella for reinforcing building components and method for placing a flat strip lamella on a component | |
PT89152A (en) | A method for attaching the top of a fabric impregnated with a rubber, for the manufacture of a shell of a carcass, and pneumatic with a shell of a carcass. | |
US10703571B2 (en) | Seamable industrial belt | |
US2916136A (en) | Sectional conveyor belt manufacture | |
CN1479845A (en) | Power transmission belt | |
AU762550B2 (en) | Preformed strip and method for splicing conveyor belts | |
US2432427A (en) | Transmission and conveyor belt | |
JP6291514B2 (en) | Conveying belt and manufacturing method thereof | |
US20050016901A1 (en) | Screening panel securing system | |
AU2002335929A1 (en) | Screening panel securing system | |
US6824876B2 (en) | Belt joint adhesive | |
JP3207330B2 (en) | Composite molding | |
US129928A (en) | Improvement in belt-splices |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): DE GB SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19851121 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: WORCESTER, WINTHORP SARGENT Inventor name: EROSKEY, RICHARD EDWIN |